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Hope Stainless Steel 30mm Bottom Bracket Hopes well proven stainless bottom brackets make an ideal choice for the consumer who is looking for longevity and a smooth transition. The machined aluminum cups hold full stainless steel INA Swiss made cartridge bearings which are custom made to give much greater life span than stock units and are also replaceable to reduce wastage and minimize expense. The bearings are designed to run directly on the crankset axle, without the use of shims or spacers which further increases lifespan and reliability when combined with the non contact, free running external labyrinth seal and O-rings on the internal aluminum center tube. Features: External bottom bracket designed for threaded bottom brackets Custom Swiss made bearings are double sealed which gives a much greater life span than stock units Free running labyrinth seal protects bearings and has less drag Bearings: Stainless Steel BB Shell: BSA Thread BB Shell Frame WIdth: 68/ 73mm Crank Spindle Diameter: 30mm Weight: 110g